Google Maps API with multiple marker

In our application or site we will be in need of showing Google MAP with markers of office or other location details. Here we will see simple example for showing a multiple animate overlay markers. Its a basic HTML code were everyone will be searching online. Lets see simple example like showing markers in Indian cities like New Delhi, Mumbai, Kolkata, Chennai, Coimbatore, Bangalore and Haldwani. Below is the code while shows marker in each cities.